Iframe.php

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<?php
namespace Magento\Payment\Block\Transparent;

class Iframe extends \Magento\Framework\View\Element\Template
{
    const REGISTRY_KEY = 'transparent_form_params';

    protected $coreRegistry;

    public function __construct(
        \Magento\Framework\View\Element\Template\Context $context,
        \Magento\Framework\Registry $registry,
        array $data = []
    ) {
        $this->coreRegistry = $registry;
        parent::__construct($context, $data);
    }

    protected function _prepareLayout()
    {
        $params = $this->coreRegistry->registry(self::REGISTRY_KEY);
        $this->setParams($params);
        return parent::_prepareLayout();
    }
}